How do I uninstall and reinstall the printer software?
To uninstall, disconnect the HP printer from your computer, open the Applications: Hewlett-Packard folder, and double-click HP Uninstaller, then follow the on-screen instructions. To reinstall, remove the CD from the drive, disconnect the USB cable, restart your computer, insert the software CD, and follow the on-screen instructions without connecting the USB cable until prompted.
From the official HP Deskjet 2540 All-in-One Printer manual, page 3
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